摘要
对 1 0 0hPa南亚高压的振荡指数及 50 0hPa西太平洋副高的强度指数、西进指数进行了谱分析 ,着重考察了 5天到一个月的振荡周期。通过分析得出 ,南亚高压的显著周期主要是准两周周期 ,西太平洋副高的显著周期主要是准一周周期 ,其次是准两周周期 ;在多数情况下 ,南亚高压东进比西太平洋副高西伸加强提前 1～ 2天 ;南亚高压的显著周期与西太平洋副高的显著周期叠加时 ,陕西地区可出现多雨时段。
In this paper, spectral analyses of both the oscillation index of the South Asia High(SAH) in 100 hPa and the index of extending westward of the West Pacific Subtropical High(WPSH) in 500 hPa have firstly been done. The results show that the oscillation of the SAH has mainly a quasi biweek period; the WPSH, a quasi week one. Usually, when the SAH moves eastward, the WPSH extends westward, the former occurs mostly one to two days earlier than the latter. Also when the periods of both the SAH and WPSH meet together, there is rainy spells in Shaanxi Province summer.
出处
《高原气象》
CSCD
北大核心
2000年第2期172-178,共7页
Plateau Meteorology
